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current | 20:18, 5 June 2020 | ![]() | 4,500 × 2,313 (522 KB) | FunkMonk | {{Information |description=Stratigraphic positions of chasmosaurine taxa. Morphospecies of Chasmosaurus (A–D) and Pentaceratops (E–J) clades which do not overlap stratigraphically. These are hypothesized to form two anagenetic lineages which resulted from a cladogenetic branching event prior to the middle Campanian. (A) “Chasmosaurus russelli”, lower Dinosaur Park Fm, ~76.8 Ma. (B) Chasmosaurus belli, middle Dinosaur Park Fm, ~76.5–76.3 Ma. (C) Vagaceratops irvinensis, upper Dinosaur Park Fm,... |
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